Saw-guide



(Nd Model.)

.J. W. MAXWELL.

' SAW GUIDE.

No. 357,678. Patented-Feb. 15, 1887.

Wm 61400000 I v S'VL'UWVIJIOZ 97. 55 %MMW!7J6M /9 3513-1113 fl cfomwu myw V UNITED STATES ATENT -@FFICE.

JOSEPH WILEY MAXVELL, OF LOUISVILLE, KENTUCKY.

SAW-GUIDE.

SPECIFICATION forming part of Letters Patent No. 357,678, dated February15. 1887.

Application filed May 19, 1886. Serial No. 202,693.

To aZZ whom it may concern.-

Be it known that I, Josnrn WILEY MAX- wELL, a citizen of the UnitedStates, residing at Louisville, in the county of Jefferson and State ofKentucky, have invented certain new and useful Improvements in Band-SawGuides; and I do hereby declare the following to be a full, clear, andexact description of theinvention, such as will enable others skilled inthe art to which it appertains to make and use the same.

This invention relates to that class of devices which are used forguiding the work on band-saw machines; and its object is, first, toprovide means whereby work may be sawed to a pattern without requiringguide-lines to be marked 011 the work; secondly, to provide meanswhereby two band-saws, or the two vertical portions of one band-saw, maybe guided to cut the two edges at once of a single piece, whether theedges are parallel or not, straight or curved, or of different degreesof curvature-much, for instance, as chair-legs, chairbottoms insegments, rockers, plow beams and handles, wheel-fellies, 81c; thirdly,in means whereby a pattern conforming to the piece to be out, beingpassed through between or besidethe saws with the lumber while it isbeing sawed, may guide the saws, respectively, to follow the curvatureof its two edges; and, fourthly, in means whereby the rear end of theform pattern may be guided so as to equalize the inclination of bothsaws relatively to a center line as nearly as possible at all times.

To this end my invention consists in the construction and combination ofparts forming band-saw guides, hereinafter described and claimed,reference being had to the accompanying drawings, in which- Figure l isa perspective view of a portion of a saw-table, showing portions of aband-saw in connection with the main features of my invention. ber of mysaw-guides, consisting of the formpattern for a chair-leg. Fig. 3 is aperspective view of another member of my saw guides, consisting of thebladeguide proper.

A represents the saw-machine table.

B represents the downcut side of the bandsaw blade, and 0 represents theupcut side thereof; or, for all purposes of this invention,

Fig. 2 is a plan view of one mem- (No model.)

Band Omight represent two independent sawblades running either up ordown or reciprocating, and they may herein he referred to as two saws,the only characteristics required of the saw or saws being a bladenarrow enough to clear its own passage around the required curves andelastic enough to bear twisting to follow the curves. The common band-saw meets these requirements, and a very long scroll-saw might do thesame.

D represents a piece of lumber being sawed.

In the present case thework represented is the sawing of a chair-leg onboth its curved edges at one movement of the lumber along or through themachine.

E represents one side, and F the other side,- of the chair-legform-pattern, the two sides being secured together at one end by a pivotor hinge, G, and at the other end by a latch, H. By unhooking this latchand opening the form-pattern it may be placed around the saws upon thebench, ready for service. The pattern is secured upon the lumber D byany usual dogs projecting from its lower side, one ofthe dogs beingprovided with a binding-1ever, I, whereby it may be loosened from thework, so that the pattern may be set in a new place after each piece iscut from the lumber, and then be forced into engagement again with thelumber. The outer edges of the parts E and F are shaped to correspond,respectively, to the edges of a chair-leg or other work to be shaped bysawing. This double pattern is suitable for use with any two saws whichare adapted to be moved transversely to and fro into different verticalplanes while at worksuch, for instance, as shown in my Patent No.339,797, on which I have made new improve ments, for which I have madeapplication of even date herewith for a patent, in which application Ihave claimed the combination of some devices herein shown with parts ofthe machine whose operation is eifected by the said devices.

' J represents rollers to travel on the edges of the form-pattern, andthey are to be mounted on the two carriages which guide the two portions13 and O of the saw. These carriages may be pressed constantly towardthe former by weights and straps guided by properly-located pulleys.

K represents the saw-guides proper, provided with vertical grooves a,through which the saw blade or blades run. These guides are pivoted tothe saw-carrying frames at points b, respectively, in front of eachblade, both above and below the saw-bench, by which means that portionof the saw-blade between the upper and lower portions of each guide maybe twisted in a plane to the right or left, out of the normal plane ofthe saw-blade, to conform to the curves of the pattern. I have devisedand tried various ways for causing these guides K to follow the curvesof the pattern. A very effective device consists of a flange, c,projecting upward from each part E and F of the formpattern, and aslotted follower, d, secured to the guide K and fitted to straddle theflange c. The flange conforming to that part of the pattern to which itis secured passing through the follower d causes it to oscillate theguide K on its pivot 1),

thereby twisting the saw-blade to positions continually tangent to thecurve of the passing pattern, and the sum of these tangents is the exactpath or kerf of the saw. A groove instead of the flange c, and a tonguefitting it, instead of a slot for the follower d,would be a mechanicalequivalent thereof, its object being in every case to guide the saw bytwisting the blade thereof to positions tangent to a passing pattern.The follower (Z is made vertically adjustable on the saw-guide to fitthe pattern. The upper and lower portions of the guide K are connectedby a yoke, N, to become one piece. To enable this guide-pattern E F tobe pushed through the machine, so as to equalize the labor at all timeson the two saws, I provide a grooved or ribbed pattern-guide, M, to besecured to the under side of the saw-machine table A,to projecttherefrom, and I provide a tongue on the under side ofthe rear end ofthe form-pattern to engage and follow the groove or rib. The groove 'iin the pattern M may readily be made to correspond with the generalcontour of the formpattern by placing a pencil instead of the followerh, then let the sawycr very carefully guide the form-pattern by his eyewhile sawing one chair-leg or other work, and afterward cut the groove2' as marked by the pencil. In some eases,where the work is very wide,it may be necessary to let the saws work at the sides of theform-pattern instead of between it; but that is only a question ofadaptation on the part of the mechanic of the principles herein setforth.

It is evident that the principal features of this invention might beused to some advantage with a machine having only a single cuttingsaw-blade; but its main purpose being to saw to a pattern both edges atonce of a piece of work, it is necessarily used in connection with adouble sawing-machine whose two saw-blades move laterally to follow thevarying width of the pattern, as hereinbefore de scribed. Such a machinebeing the subject of a cotemporary application for a patent, no claim isherein laid to anything but the sawguides, as follows:

Vhat I claim herein, and desire to secure by Letters Patent, is-

l. The combination, in saw-guides, of two form-patterns arranged side byside at some distance apart and separably secured togetherat their ends,each of the said patterns being shaped on one edge in conformity withthe work to be sawed and adapted to be secured to the work,substantially as shown and described.

2. The combination, with a form-pattern shaped to conform to the Work tobe sawed and adapted to be clamped thereto, of pivoted saw-guidesslotted to receive the saw-blade and provided each with afolloweradapted to follow the form -pattern, substantially as shown anddescribed, whereby the saw-blade will be twisted by the passingform-pattern, as set forth.

3. The combination of a saw form-pattern shaped at its edges inconformity with the work to be sawed, a pivoted slotted guide to receivethe saw-blade, a flange upon the formpattern conforming with its edge,and a follower attaehed to the saw-guide and adapted to engage andfollow the said flange, subst-an tially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH WILEY MAXW'ELL.

Witnesses:

CHRISTIAN KORE, J. G. NAPIER.

